Amplifying Type K Thermocouple for high temp reading with USB 6008

I am attempting to amplify a type K thermocouple so that the signal can be read somewhat accurately by a USB-6008. I have looked at the AD595 chip but it states a maximum useful temperature of 100 C and I am going to need to be reading up to 700 C.
Is there another amplifier chip that would work up to this temperature, or should I resign myself to using the signal unamplified and getting a very inaccurate (~30 C/division) reading for temperature?
Solved!
Go to Solution.

A heads up- some people have ran into issues using the chip with the USB-600x devices, various solutions. You may want to browse of these posts ahead of time:
http://forums.ni.com/ni/search?board_id=170&submitted=true&q=AD595
-AK2DM
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"It’s the questions that drive us.”
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EEM for high CPU C4510R with SUP7E

Hi all,
I have a client that experiences high CPU usage on a pair of C4510Rs at random times. The issue causes their HSRP to flap which in turn causes network outages. It only seems to occur for around 10 to 15 minutes and by the time I am called to look into the problem it has passed. I suspect it is some type of traffic that is being CPU punted and is overloading the CPU and I would like to collect some CPU stats and CPU packet captures while the problem is occuring to further troubleshoot.
I used a previous C4510R EEM script (https://supportforums.cisco.com/thread/2065177) as a template and created the following script:
event manager applet cpu_stats
event snmp oid 1.3.6.1.4.1.9.9.109.1.1.1.1.3.1 get-type exact entry-op ge entry-val "70" exit-op lt exit-val "70" poll-interval 5 maxrun 300
action 1.01 syslog msg "------HIGH CPU DETECTED----, CPU: $_snmp_oid_val %"
action 1.02 cli command "enable"
action 1.03 cli command "show clock | append bootflash:cpu_stats"
action 1.04 cli command "show proc cpu sort | append bootflash:cpu_stats"
action 1.05 cli command "show platform health | append bootflash:cpu_stats"
action 1.06 cli command "debug platform packet all count"
action 1.07 cli command "show platform cpu packet statistics | append bootflash:cpu_stats"
action 1.08 cli command "show proc cpu history | append bootflash:cpu_stats"
action 1.09 cli command "debug platform packet all receive buffer"
action 1.10 cli command "show platform cpu packet buffered | append bootflash:cpu_stats"
action 1.11 cli command "show proc cpu sort | append bootflash:cpu_stats"
action 1.12 cli command "show platform cpu packet statistics | append bootflash:cpu_stats"
action 1.13 cli command "Show proc cpu history | append bootflash:cpu_stats"
action 1.14 cli command "show platform cpu packet buffered | append bootflash:cpu_stats"
action 1.15 cli command "show log | append bootflash:cpu_stats"
action 1.16 cli command "undebug all"
end
However when looking at the CPU history after the problem occured again it appears that the SUP7E has one physical CPU that has two cores and one or two of the cores hits 100% when the issue occurs while the system CPU stays low as can be seen below:
C4510#show proc cpu hist
History information for system:
output omitted
    111111111115511111111111111111111111111111111111111111111111111111111111
    600105000112231001211131111017221011110001112010212016101010121012112112
100
90
80
70
60
50            **
40            **
30            #*
20 *    *     ##                *                       *
10 ########################################################################
   0....5....1....1....2....2....3....3....4....4....5....5....6....6....7.
             0    5    0    5    0    5    0    5    0    5    0    5    0
                       CPU% per hour (last 72 hours)
                    * = maximum CPU%   # = average CPU%
History information for core 0:
output omitted
               991
    888787888789968888787877787787888788787888879898888898888788
100            **
90            **
80            **
70            **
60            **
50            **
40            **
30            *#
20            ##*
10 ***********##***********************************************************
   0....5....1....1....2....2....3....3....4....4....5....5....6....6....7.
             0    5    0    5    0    5    0    5    0    5    0    5    0
                       CPU% per hour (last 72 hours)
                    * = maximum CPU%   # = average CPU%
History information for core 1:
output omitted
    211112111119921111111111111113111111111111111111111112111111
    855554544659906476955796556651995456554446767454847468565565
100            **
90            **
80            **
70            **
60            **
50            **
40            **
30 *          #*                *                       *
20 ******* **##** ***************** ****   **** * * * ********************
10 ########################################################################
   0....5....1....1....2....2....3....3....4....4....5....5....6....6....7.
             0    5    0    5    0    5    0    5    0    5    0    5    0
                       CPU% per hour (last 72 hours)
                    * = maximum CPU%   # = average CPU%
So I walked through the SNMP OIDs for the two cores without luck (also came across this article
https://supportforums.cisco.com/thread/2179888 to create SNMP OIDs for the cores by parsing the output of "show proc cpu" with a cron job). An SNMP walk of the CPU MIBs comes back with the following:
.1.3.6.1.4.1.9.9.109.1.1.1.1.3        - cpmCPUTotal5sec.5000
.1.3.6.1.4.1.9.9.109.1.1.1.1.4        - cpmCPUTotal1min.5000
.1.3.6.1.4.1.9.9.109.1.1.1.1.5        - cpmCPUTotal5min.5000
.1.3.6.1.4.1.9.9.109.1.1.1.1.6        - cpmCPUTotal5secRev.5000
.1.3.6.1.4.1.9.9.109.1.1.1.1.7        - cpmCPUTotal1minRev.5000
.1.3.6.1.4.1.9.9.109.1.1.1.1.8        - cpmCPUTotal5minRev.5000
Each of which seems to correspond with the system CPU. So in order to continue without creating an overly complex EEM scripts that parse the show proc cpu output and pass it to another EEM script that checks the value I decided to try a lower entry and exit value of 40%. The next time the problem occured the system CPU went over 40% but did not seem to trigger the script. What is important to note is the first time I did a full SNMP walk of the OID I was able to get the CPU over 50% and the script triggered.
So I moved down to 20% for the trigger value, tried with different SNMP OIDs like .1.3.6.1.4.1.9.9.109.1.1.1.1.6.5000 and doing an SNMP walk of the Cisco MIB without success in getting the script triggered (see attached output). Is there a problem with the script or the SNMP MIBs I am using?
Thanks in advance!
David.

Hi Joseph
I have written the following set of scripts to do the job (good to just post them here if anyone else is having the same problem!), I have tested individual components and they all seem to function as expected, so just waiting now for the high cpu event to occur again:
The first script is just to set the prev_cpu_state to low so the main script can detect the first transition to high and does not spit log messages out every minute because the context variable is not initialised:
event manager applet set_cpu_state
event none
action 1.01 handle-error type ignore
action 1.02 context retrieve key CPU_STATE variable prev_cpu_state
action 1.03 handle-error type exit
action 1.04 set prev_cpu_state "low"
action 1.05 context save key CPU_STATE variable prev_cpu_state
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event manager applet dualcore
event timer cron cron-entry "* * * * 0-6"
action 1.00 cli command "en"
action 1.01 cli command "show process cpu | include five"
action 1.02 regexp "Core 0: CPU utilization for five seconds: ([0-9]+)%" $_cli_result result c0cpu5sec
action 1.03 if $_regexp_result eq 1
action 1.04 end
action 1.05 regexp "Core 1: CPU utilization for five seconds: ([0-9]+)%" $_cli_result result c1cpu5sec
action 1.06 if $_regexp_result eq 1
action 1.07 end
action 1.08 handle-error type ignore
action 1.09 context retrieve key CPU_STATE variable prev_cpu_state
action 1.11 handle-error type exit
action 1.12 if $c0cpu5sec ge $c1cpu5sec
action 1.13 set highest_core $c0cpu5sec
action 1.14 else
action 1.15 set highest_core $c1cpu5sec
action 1.16 end
action 1.17 if $highest_core ge 50
action 1.18 if $prev_cpu_state eq low
action 1.19   set prev_cpu_state "high"
action 1.20   syslog msg "----HIGH CPU DETECTED----, CPU: $highest_core %"
action 1.21   cli command "event manager run collect_stats"
action 1.22 end
action 1.23 else
action 1.24 if $prev_cpu_state eq high
action 1.25   set prev_cpu_state "low"
action 1.26   syslog msg "----CPU BACK TO NORMAL----, CPU: $highest_core %"
action 1.27 end
action 1.28 end
action 1.29 context save key CPU_STATE variable prev_cpu_state
The third script just runs all of the require show commands for debugging the issue and appends the output to a file called cpu_stats on the bootflash:
event manager applet collect_stats
event none
action 1.02 cli command "enable"
action 1.03 cli command "show clock | append bootflash:cpu_stats"
action 1.04 cli command "show proc cpu sort | append bootflash:cpu_stats"
action 1.05 cli command "show platform health | append bootflash:cpu_stats"
action 1.06 cli command "debug platform packet all count"
action 1.07 cli command "show platform cpu packet statistics | append bootflash:cpu_stats"
action 1.08 cli command "show proc cpu history | append bootflash:cpu_stats"
action 1.09 cli command "debug platform packet all receive buffer"
action 1.10 cli command "show platform cpu packet buffered | append bootflash:cpu_stats"
action 1.11 cli command "show proc cpu sort | append bootflash:cpu_stats"
action 1.12 cli command "show platform cpu packet statistics | append bootflash:cpu_stats"
action 1.13 cli command "Show proc cpu history | append bootflash:cpu_stats"
action 1.14 cli command "show platform cpu packet buffered | append bootflash:cpu_stats"
action 1.15 cli command "show log | append bootflash:cpu_stats"
action 1.16 cli command "undebug all"
end
Regards,
David.

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Solved!
Go to Solution.

Hi Craig,
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Here's my data, its in an Excel work book format with the graphs highlighting the behavior I'm talking about. I ran this test using both a type B and a type K thermocouple for
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Attachments:
Thermocouple Data.xls ‏4054 KB

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Amplifying Type K Thermocouple for high temp reading with USB 6008

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